You can either let Gickr pull images from a specific tag on your Flickr account, or you can individually upload images (maximum of 10) to Gickr that you want turned into your animated GIF. Gickr works with snappy AJAX-y goodness (but who doesn't these days), and really does provide a simple way to create an animated image (whether you're going for a time lapse or just slide show). This kind of tool may come in handy if you want to put together an animation/slideshow but you don't want to embed something that requires a little Flash. Thanks Mark!